The Rock of Gibraltar is a monolithic limestone mountain 426 m (1,398 ft) high dominating the western entrance to the Mediterranean Sea. It is situated near the end of a narrow 9 kilometres (5.6 mi) long promontory stretching due south into the Mediterranean Sea and is located within the British territory of Gibraltar, and is 27 km north-east of Tarifa, Spain, the southwestern tip of Europe on the Iberian Peninsula. The rock serves as an impregnable fortress and contains a labyrinthine network of man-made tunnels known as the Tunnels of Gibraltar. Most of the Rock's upper area comprises a nature reserve which is home to about 300 Barbary macaques. It is a major tourist attraction.
A sea cave, is also known as a littoral cave, a type of cave formed primarily by the wave action of the sea. The primary process involved is erosion. Sea caves are found throughout the world, actively forming along present coastlines and as relict sea caves on former coastlines. Some of the largest wave-cut caves in the world are found on the coast of Norway, but are now 100 feet or more above present sea level. These would still be classified as littoral caves. By contrast, in places like Thailand's Phang Nga Bay, solutionally formed caves in limestone have been flooded by the rising sea and are now subject to littoral erosion, representing a new phase of their enlargement.
Carlsbad Caverns National Park is a national park of the United States in the Guadalupe Mountains of southeastern New Mexico. The primary attraction of the park is the show cave Carlsbad Cavern. Visitors to the cave can hike in on their own via the natural entrance or take an elevator from the visitor center.
Talking Rocks Cavern is a cavern system located in Stone County, just west of Reeds Spring, in Branson West, in the U.S. state of Missouri. It is privately owned by Herschend Family Entertainment, and operated by Adventure Creations Inc., as a public entertainment/educational attraction.
St. Michael's Cave or Old St. Michael's Cave is the name given to a network of limestone caves located within the Upper Rock Nature Reserve in the British Overseas Territory of Gibraltar, at a height of over 300 metres (980 ft) above sea level. According to Alonso Hernández del Portillo, the first historian of Gibraltar, its name is derived from a similar grotto in Monte Gargano near the Sanctuary of Monte Sant'Angelo in Apulia, Italy, where the archangel Michael is said to have appeared.
The Nidderdale Caves are a series of caves in Upper Nidderdale in North Yorkshire, England. There are two cave systems and most of the caves are in some way linked with one or the other. The smaller system is the Eglin cave system in the valley of How Stean Beck, a tributary of the River Nidd, associated with How Stean Gorge. The larger system is the Goyden cave system under the valley of the River Nidd, which flows east from Scar House Reservoir, then south, and shortly after disappears underground down several sinkholes to reappear at the rising just beyond the village of Lofthouse. Cavers can access several sections of this system via the different entrances.
The Gibraltar Nature Reserve is a protected nature reserve in the British Overseas Territory of Gibraltar that covers over 40% of the territory's land area. It was established as the Upper Rock Nature Reserve in 1993 under the International Union for Conservation of Nature's category Ia and was last extended in 2013. It is known for its semi-wild population of Barbary macaques, and is an important resting point for migrating birds.
Princess Royal's Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located on Willis's Plateau at the northern end of the Upper Rock Nature Reserve, just southeast of Princess Anne's Battery. Formerly known as Willis' Battery, and later, Queen Anne's Battery or Queen's Battery, it was renamed in the late 18th century after Charlotte, Princess Royal, the eldest daughter of George III. The battery was active from the early 18th century until at least the mid-20th century. However, it has been decommissioned and guns are no longer present. Princess Royal's Battery is listed with the Gibraltar Heritage Trust.
Martin's Cave is a cave in the British Overseas Territory of Gibraltar. It opens on the eastern cliffs of the Rock of Gibraltar, below its summit at O'Hara's Battery. It is an ancient sea cave, though it is now located over 700 feet (210 m) above the shore of the Mediterranean Sea. It is only accessible because Martin's Path was constructed.
Bray's Cave is a limestone cave in the British Overseas Territory of Gibraltar. The cave has yielded several significant human remains and artifacts from the Neolithic and Bronze Ages. Three almost complete skulls were discovered, along with other cranial fragments from multiple individuals. This suggests that people repeatedly returned to the site to reuse it as a burial ground.
Fig Tree Cave is a cave in the British Overseas Territory of Gibraltar. It is located on the eastern cliffs of the Rock of Gibraltar, not far from Martin's Cave within the Upper Rock Nature Reserve. It is listed in the Heritage and Antiquities Act 2018 by the Government of Gibraltar.
The Genista Caves are a series of caves located under Windmill Hill in the British Overseas Territory of Gibraltar. Fossils of various mammals and human remains were discovered here in the mid-1860s. The name of the caves is a play on words based on Captain Frederick Brome's name, who discovered them.
Pete's Paradise Cave is a cave in the British Overseas Territory of Gibraltar. Explored in the 1960s and 1970s by a team led by George Palao, four skeletons have been unearthed in the cave, two of which were female skeletons with crushed skulls.
Gibbon's Cave is a cave in the British Overseas Territory of Gibraltar. Gibbon's Cave is at the southern end of the Upper Rock Nature Reserve just to the west of Tina's Fissure, George's Bottom Cave and Levant Cave which are a close group of three caves.
Leonora's Caves is a limestone cave system in the British Overseas Territory of Gibraltar. They are located within Old St. Michael's Cave.
Spider Cave is a limestone cave in the British Overseas Territory of Gibraltar. It is located within the Upper Rock Nature Reserve.
Death's Head Hole is a cave on Leck Fell, in Lancashire, England. Its entrance is a 64-metre (210 ft) deep shaft. It leads into Lost Johns' Cave and is part of the Three Counties System, an 87-kilometre (54 mi) cave system which spans the borders of Cumbria, Lancashire, and North Yorkshire.
The Long Kin East Cave - Rift Pot system is a limestone cave system on the southern flanks of Ingleborough, North Yorkshire in England lying within the designated Ingleborough Site of Special Scientific Interest. Long Kin East Cave starts as a long meandering stream passage but then plummets down a 58-metre (190 ft) deep shaft when it meets a shattered fault into which Rift Pot also descends. At the bottom, the stream flows through some low canals and sumps, to eventually emerge at Austwick Beck Head in Crummackdale.
